Perhaps you should try some spelling variations:
thieu khang » chieu khong
thieu quang » hieu quang, thien quan, trien quang
thieu sang » chieu sang, hieu lang, nhieu tang
nhung dung » phuong dung, ung dung, thong dung
cua nhung » va nhung
dung vanh » duong vanh, dung van, dung danh
vanh quan » van quan, anh quan, manh quan
canh ban » can ban, canh dan, canh van
ban cua » ban quan
quan ha » quan he

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((((thieu sang) OR (thieu quang))) or (thieu khang)) - canh ban cua nhung dung vanh quan ha~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((((thieu sang) OR (thieu quang))) OR (thieu khang)) - canh ban cua nhung dung vanh quan ha.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((((thieu sang) OR (thieu quang))) or (thieu khang)) - canh ban cua nhung dung vanh quan ha".
• Adding a wildcard symbol may retrieve word variants: hoc ((((thieu sang) OR (thieu quang))) or (thieu khang)) - canh ban cua nhung dung vanh quan ha*.